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摘要

Photo on cover courtesy of Republic Services. Photos on page 7 courtesy of Repbulic Services and ? Shutterstock users Nicole Glass Photography and Thanatos Media. Photos on pages 8-20 ? Shutterstock users Photick, paulaphoto, Rokas Tenys and noomcpk and courtesy of Eco-Cycle, AMP Robotics, Glass Half Full and Ocean Conservancy. Photos on pages 22-24 courtesy of Busch Systems and University of Georgia Office of Sustainability. Photo on page 26 ? seamind224 / Shutterstock. Photo on page 30 ? INTREEGUE Photography / Shutterstock. Photo on page 32 courtesy of Minnesota Pollution Control Agency. Photo on page 34 ? Song_about_summer / Shutterstock. Photo on page 40 ? Don Pablo / Shutterstock. Photos on pages 42-43 courtesy of Toter, West Salem Machinery and BCA Industries. Photos on page 44 ? Shuttestock users Kawin168, NIKCOA, Konektus Photo and Roschetzky Photography.